Reading spark plugs

[nsbluenose]

Just removed plugs from my Singer. 1725 cc with 32/36 Weber. Plugs are NGK BP6ES. Plugs have about 7000 total miles on them, about 150 miles since cleaning and regaping in the spring.
1,2,3,4 cylinders, left to right.
Is this a healthy colour?

 

[spmdr]

OK, I'll bite.

In general, they look quite good.

However, the dark ground electrode of #2 suggests

some checking of that cylinder is in order.

DW

 

[belmateo]

Correct way to check them is after high rpm and shut it off immediately, #2 plug could not be gapped correctly.

 

[nsbluenose]

Plugs were gapped to .030, #2 was a little tight, but not excessively so. My drive before shutting off was mostly low speed, 30 mph.